Just where did you get that from? Certainly not from the paper.

I think they're talking about this bit:

> We finally observed signals of selection for combinations of alleles that today are associated with three correlated behavioural traits: scores on intelligence tests (increasing γ = 0.74 ± 0.12), household income (increasing γ = 1.12 ± 0.12) and years of schooling (increasing γ = 0.63 ± 0.13). These signals are all highly polygenic, and we have to drop 449–1,056 loci for the signals to become non-significant (Extended Data Fig. 10). The signals are largely driven by selection before approximately 2,000 years )*, after which γ tends towards zero

Presumably pressure in different regions lead to different combinations of those alleles, which I think they are shorthanding a bit, but the fact that those alleles exist makes blank slate theory a kind of rough assumption

There is a graph arguing “intelligence” has been positively selected in west Eurasian population in this paper according to a polygenic score (page 8 fig. 4)

Now I would be quite curious to know how they constructed this polygenic score

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Racists are hilarious. They will twist and bend anything remotely applicable to fit and underpin their prejudices.